Typical Home Lan/Wan Setup (NAT)

Posted in Basic Networking on February 27, 2009 by itdaddy

typicalhomenat1

 

A picture can represent a 1,000 words. I really like this network map on the basics of home LAN/WAN setup using NAT.

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Non-Routable (Private) IP

Posted in Non Routable IPs on February 27, 2009 by itdaddy

Non-Routable (Private) IP

 

RFC 1597 provides for a group of Internet Networks that will never be assigned. Furthermore, these addresses will not route through the Internet.

This makes them the proper choice for use in your home or company Intranet. We recommend non-routable IP for most networks. These IP addresses have specifically been set aside to use when it isn’t necessary (or desirable) for anyone on the Internet to be able to instantly navigate to your computer. It is especially useful to the DSL and Cable Modem users who have multiple computers connected to a single proxy server, firewall or router.

These non-routable IP addresses also provide additional security on the “Internal” side of your network. Typically a firewall, Cable Modem or DSL router will provide Network Address Translation (NAT) to translate the these nonroutable address to a real Internet routable IP address.

Reserved IP addresses for private networks

10.0.0.0 – 10.255.255.255                     /8
172.16.0.0 – 172.31.255.255                 /12
192.168.0.0 – 192.168.255.255             /16

169.254.0.0 – 169.254.255.255    APIPA  – Windows OS systems.

Automatic Private IP addressing

run and ipconfig /all on your windows system and you might see an address such as 169.254.x.y. This happens when you PC cannot find the DHCP server. It will make ups its own ip address. To get rid of this you just run.

ipconfig /release

ipconfig /renew

Best IDLE PC Value-Best IOS Image 2691

Posted in GN3 Best Image Best IDLE PC Value on February 24, 2009 by itdaddy

 

mypc

Finally this is my PC specs: above screen shot. Basically it has 2 cpu

cpus

2691ios

Finally, I found a great GNS3 IOS image and IDLE PC value! Yes!

 

IOS: c2691-adventerprisek9_sna-mz.124-13b.bin

idle pc value: Ox60b70574

I have no problems running 5 and 6 routers with almost no cpu running say about 2 to 5 percent only. Finally, after much trial and error.

Cause and Effect Learning- Is Key

Posted in How to Learn on February 24, 2009 by itdaddy

noexectimout

I want to talk about the best kind of learning. The best kind of learning is learning with cause and effect. The kind of learning that affects you as a person. Here are some examples:

  1. Learning to save money because you have no money and when there is a rainy day (there are many in life), you have it.
  2. You learn to prioritize your money and learn needs from wants when you as a teenager and livinging on your own figure out do I want to starve or do I want that new XBOX game???
  3. Touching a hot stove? dating a pyscho girlfriend? you learn not to go there anymore because it hurts.
  4. Above screen shot is of a CLI prompt that has timed out. What command do I use for a console port time out??

R2(config)#
R2(config)#
R2(config)#line con 0
R2(config-line)#no exec-timeout

The best kind of learning is real “cause and effect” learning. I was so annoyed by this console timing out I just know the command by heart. Another command is for when you type something by accident and your CLI is looking for ip domain lookup and locks up: type this so you device doesn’t look for domain lookups:

R2(config)#no ip domain-lookup

Bottom Line in learning: “Cause and Effect” learning. Having to remember something because you have to be able to move on to the next item. This is how we learn over time in a job. So if somehow we  can build learning labs in the form of forcing us to remember by doing then I believe we can achieve great heights in learning and success in passing exams will be better for us.

Study with pressure-perform Excellently!

Posted in How to Perform Under Pressure on February 23, 2009 by itdaddy

 brain_2

Read Scientific Mind article about how not to choke. Great for studying for Cisco exams or any exams.

Summary of article: Study and train under pressure and when you take your exams, you will do better. Train how you are to be tested and you will do much better. Time your studies; race yourself in your command setups and configurations. The Cerebellum is the back of the brain and is where you perform things and skills automatically without observing yourself or thinking consciously about it. Example typing is a Cerebellum operation or you could think about it but when you do it is much slower. As soon as you start judgingyourself and thinking about whatyou are doing you mess up. Study where it becomes natural and a part of your brain who you are. And then study with a timer. I am studying with a kitchen timer know. So I can create some pressure while I study..I will let you know how it turns out. I am excited to race the clock….create pressure and jam!

http://www.sciam.com/article.cfm?id=how-to-avoid-choking-under-pressure&page=2

Fro a number of years now we have been developing and working with a technology that allows athletes (from any sport) to reproduce the exact action and function they perform in competition, under loads and at speeds that replicate on field performances. By combining this with heightened noise levels during training the elevation in proprioception is producing excellent results in competition and time taken for completion of tasks reduces dramatically. Its clear that if you get athletes training functionally and under higher time / noise stress levels they can translate that into superior performance on the field. Chris Toal

EIGRP Basics…

Posted in EIGRP on February 22, 2009 by itdaddy

EIGRP uses Dual algorithm to build its routing t ables. The following are terms that deal with the core of EIGRP:

  • FD  – feasible distance
  • AD – advertised distance
  • Successor – Primary route
  • Feasible Successor – Secondary or backup route
  • Active – dual is using the route in its calculations
  • Passive – dual is not using the route in its calculations

How Feasible successor candidate becomes feasible successor:

To be considered a feasible successor, the AD of the feasible successor candidate must be less than the FD of the successor.

Once the feasible successor is picked, it makes it to the Topology Table. There are three tables in EIGRP we are concerned about:

  • Routing Table – Successor
  • Topology Table -shows feasible succesor
  • Neighbor Table – neigbors

Tclsh Scripts Cool..must learn more..

Posted in Tclsh scripts more please! on February 22, 2009 by itdaddy

foreach address { 10.1.1.1 10.1.2.1 10.1.3.1 10.1.4.1 10.100.12.1 10.2.1.1 10.2.2.1 10.2.3.1 10.2.4.1 10.100.12.2 } { ping $address } tclquit